Cover for a drain



FIG. 1 is a perspective view of a cover for a drain showing the new design;

FIG. 2 is a front side view thereof;

FIG. 3 is a rear side view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

The broken lines in the drawings represent portions of the cover for a drain that form no part of the claim. 

CLAIM The ornamental design for a cover for a drain, as shown and described. 